Railsチュートリアル９章 BCryptエラー、ActionViewTemplateエラー

Question

Railsチュートリアルの９章に現在取り組んでいるのですが、
エラーが三つある状態です。

１つめはUserのmodelの中に保存されているデータの保存のされ方の問題という風に調べると出てきたのでユーザーをリセットし、もう一度登録したのですが、何も変わらない状態です。
また。２、３こめのActionview:Template:Errorは予期せぬ場所に飛ばされているという意味だと理解しているのですが、初学なので全てコピーアンドペーストでやってきたので何が悪いのかわからない状態です。
勉強し始めなので、質問の仕方など、至らない点も多いと思いますが、よろしくお願いいたします。

ターミナル

Running via Spring preloader in process 6852
Run options: --seed 29218

# Running:

...E

Error:
UserTest#test_authenticated?_should_return_false_for_a_user_with_nil_digest:
BCrypt::Errors::InvalidHash: invalid hash
    app/models/user.rb:32:in `new'
    app/models/user.rb:32:in `authenticated?'
    test/models/user_test.rb:77:in `block in <class:UserTest>'
bin/rails test test/models/user_test.rb:76
.........E
Error:
UsersEditTest#test_successful_edit:
ActionView::Template::Error: First argument in form cannot contain nil or be empty
    app/views/users/edit.html.erb:6:in `_app_views_users_edit_html_erb___280578002934169021_45554900'
    test/integration/users_edit_test.rb:24:in `block in <class:UsersEditTest>'
bin/rails test test/integration/users_edit_test.rb:22
E
Error:
UsersEditTest#test_unsuccessful_edit:
ActionView::Template::Error: First argument in form cannot contain nil or be empty
    app/views/users/edit.html.erb:6:in `_app_views_users_edit_html_erb___280578002934169021_45554900'
    test/integration/users_edit_test.rb:11:in `block in <class:UsersEditTest>'
bin/rails test test/integration/users_edit_test.rb:9
..............
Finished in 0.641378s, 45.2151 runs/s, 106.0217 assertions/s.
29 runs, 68 assertions, 0 failures, 3 errors, 0 skips

edit.html.erb

<% provide(:title, "Edit user") %>
<h1>Update your profile</h1>

<div class="row">
  <div class="col-md-6 col-md-offset-3">
    <%= form_for(@user) do |f| %>
      <%= render 'shared/error_messages' %>

      <%= f.label :name %>
      <%= f.text_field :name, class: 'form-control' %>

      <%= f.label :email %>
      <%= f.email_field :email, class: 'form-control' %>

      <%= f.label :password %>
      <%= f.password_field :password, class: 'form-control' %>

      <%= f.label :password_confirmation, "Confirmation" %>
      <%= f.password_field :password_confirmation, class: 'form-control' %>

      <%= f.submit "Save changes", class: "btn btn-primary" %>
    <% end %>

    <div class="gravatar_edit">
      <%= gravatar_for @user %>
      <a href="http://gravatar.com/emails" target="_blank">change</a>
    </div>
  </div>
</div>

user.edit.test.rb

require 'test_helper'

class UsersEditTest < ActionDispatch::IntegrationTest

  def setup
    @user = users(:michael)
  end

  test "unsuccessful edit" do
    log_in_as(@user)
    get edit_user_path(@user)
    assert_template 'users/edit'
    patch user_path(@user), params: { user: { name:  "",
                                              email: "foo@invalid",
                                              password:              "foo",
                                              password_confirmation: "bar" } }

    assert_template 'users/edit'
  end
  
  
  test "successful edit" do
    log_in_as(@user)
    get edit_user_path(@user)
    assert_redirected_to edit_user_url(@user)
    name  = "Foo Bar"
    email = "[e-mail]"
    patch user_path(@user), params: { user: { name:  name,
                                              email: email,
                                              password:              "",
                                              password_confirmation: "" } }
    assert_not flash.empty?
    assert_redirected_to @user
    @user.reload
    assert_equal name,  @user.name
    assert_equal email, @user.email
  end
end

user.test.rb

require 'test_helper'

class UserTest < ActiveSupport::TestCase

  def setup
    @user = User.new(name: "Example User", email: "[e-mail]",
                     password: "foobar", password_confirmation: "foobar")
  end

  test "should be valid" do
    assert @user.valid?
  end
  
  test "name should be present" do
    @user.name = "     "
    assert_not @user.valid?
  end
  
  test "email should be present" do
    @user.email = "     "
    assert_not @user.valid?
  end
  
   test "name should not be too long" do
    @user.name = "a" * 51
    assert_not @user.valid?
  end

  test "email should not be too long" do
    @user.email = "a" * 244 + "@example.com"
    assert_not @user.valid?
  end
  
  test "email validation should accept valid addresses" do
    valid_addresses = %w[[e-mail] [e-mail] [e-mail]
                         [e-mail] [e-mail]]
    valid_addresses.each do |valid_address|
      @user.email = valid_address
      assert @user.valid?, "#{valid_address.inspect} should be valid"
    end
  end
  
  test "email validation should reject invalid addresses" do
    invalid_addresses = %w[user@example,com user_at_foo.org user.name@example.
                           foo@bar_baz.com foo@bar+baz.com]
    invalid_addresses.each do |invalid_address|
      @user.email = invalid_address
      assert_not @user.valid?, "#{invalid_address.inspect} should be invalid"
    end
  end
  
  test "email addresses should be unique" do
    duplicate_user = @user.dup
    duplicate_user.email = @user.email.upcase
    @user.save
    assert_not duplicate_user.valid?
  end
  
  test "email addresses should be saved as lower-case" do
    mixed_case_email = "[e-mail]"
    @user.email = mixed_case_email
    @user.save
    assert_equal mixed_case_email.downcase, @user.reload.email
  end
  
  test "password should be present (nonblank)" do
    @user.password = @user.password_confirmation = " " * 6
    assert_not @user.valid?
  end

  test "password should have a minimum length" do
    @user.password = @user.password_confirmation = "a" * 5
    assert_not @user.valid?
  end
  
  test "authenticated? should return false for a user with nil digest" do
    assert_not @user.authenticated?('')
  end
end